Chef Server Variants
- Chef Server has three different variants used for different purposes
- Chef Infra Server:
- This is production grade infra server written in ruby on rails which can be used for chef infra.
- Preferred way for run chef in enterprises.
- Chef Zero:
- It is an easy-install in-memory chef server.
- It is a single node setup (It Runs locally)
- This is used for chef-client testing
- Test Kitchen uses chef zero to simulate chef-server
- Chef Solo:
- This is an open-source version of chef-client that allows you to run cookbooks without installing chef-server
- It is a single node setup (It Runs locally)
- It executes Chef-infra client in a way that it doesnot require chef server
- This is used by infra provisioning tools like terraform/packer etc
Writing Tests
- Lets create a cookbook for installing tomcat 9 on ubuntu 18.04
- Documentation reference [Refer Here]
- Manual Steps – flavor 1
sudo apt-get update
sudo apt-get install openjdk-11-jdk -y
wget http://www-us.apache.org/dist/tomcat/tomcat-9/v9.0.35/bin/apache-tomcat-9.0.35.tar.gz
tar xzf apache-tomcat-9.0.35.tar.gz
sudo mv apache-tomcat-9.0.35 /usr/local/tomcat9
echo "export CATALINA_HOME="/usr/local/tomcat9"" >> ~/.bashrc
echo "export JAVA_HOME="/usr/lib/jvm/java-11-oracle"" >> ~/.bashrc
echo "export JRE_HOME="/usr/lib/jvm/java-11-oracle"" >> ~/.bashrc
source ~/.bashrc
<!-- user manager can access only manager section -->
<role rolename="manager-gui" />
<user username="manager" password="_SECRET_PASSWORD_" roles="manager-gui" />
conf/tomcat-users.xml
<!-- user admin can access manager and admin section both -->
<role rolename="admin-gui" />
<user username="admin" password="_SECRET_PASSWORD_" roles="manager-gui,admin-gui" />
sudo apt-get update
sudo apt-get install openjdk-11-jdk -y
sudo apt-get install tomcat9 -y
sudo apt-get install tomcat9-admin tomcat9-docs tomcat9-user tomcat9-examples tomcat9-common -y
edit /etc/tomcat7/tomcat-users.xml to add
<user username="admin" password="password" roles="manager-gui,admin-gui"/>
- Lets start with flavor2
- Try writing a recipe for the above steps
- To create configuration files with static content we can create a file in the chef cookbook.
chef generate file . tomcat-users.xml
- To copy the files from local cookbook to chef node there is a resource called as cookbook_file Refer Here
- The contents of this cookbook are shared over here
Chef Inspec
- Chef Inspec is an open-source framework for testing and auditing your applications & infrastructure.
- Chef works by comparing the actual state of test kitchen instance with the expressed state of yours in easy to write inspec code.
- Inspec desired state expression looks as shown below
describe <entity> do
it { <expectation> }
end
- In the <entity> section we can use inspec resources Refer Here
- Expectations can be set by matchers Refer Here
- Sample Test Execution
- The test code is hosted at here
